US7911711B1ActiveUtility

Photographing optical lens assembly

98
Assignee: LARGAN PRECISION CO LTDPriority: Apr 23, 2010Filed: Aug 4, 2010Granted: Mar 22, 2011
Est. expiryApr 23, 2030(~3.8 yrs left)· nominal 20-yr term from priority
Inventors:Hsiang-Chi TangTsung-Han Tsai
G02B 13/0045
98
PatentIndex Score
100
Cited by
3
References
25
Claims

Abstract

This invention provides a photographing optical lens assembly including, in order from an object side toward an image side: a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface, a third lens element with positive refractive power, a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface, and at least one of surfaces thereof being aspheric, a plastic fifth lens element having a convex object-side surface and a concave image-side surface with at least one inflection point. An aperture stop is positioned between an imaged object and the third lens element. The photographing optical lens assembly further comprises an electronic sensor on which the object is imaged.

Claims

exact text as granted — not AI-modified
1. A photographing optical lens assembly comprising five lens elements with refractive power, in order from an object side to an image side:
 a first lens element with positive refractive power having a convex object-side surface; 
 a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface; 
 a third lens element with positive refractive power; 
 a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface, at least one of the object-side and image-side surfaces thereof being aspheric; and 
 a fifth lens element having a convex object-side surface and a concave image-side surface on which at least one inflection point is formed, made of plastic; 
 wherein the photographing optical lens assembly further comprises an aperture stop disposed between an imaged object and the third lens element, and an electronic sensor for image formation; wherein the first lens element is the lens element with refractive power closest to the object, and there are at most six lens elements with refractive power; and 
 wherein a radius of curvature on the image-side surface of the second lens element is R4, a focal length of the photographing optical lens assembly is f, an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, a distance on the optical axis between the aperture stop and the electronic sensor is SL, a distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, and they satisfy the relation:
   0.3< R 4 /f< 30.0; 
   23.0<V1-V2<45.0; 
   0.65 <SL/TTL< 1.10. 
 
 
     
     
       2. The photographing optical lens assembly according to  claim 1 , wherein the lens element has a concave object-side surface and a convex image-side surface. 
     
     
       3. The photographing optical lens assembly according to  claim 2 , wherein the focal length of the photographing optical lens assembly is f, a focal length of the first lens element is f1, and they satisfy the relation:
   0.80 <f/f 1<2.00. 
 
     
     
       4. The photographing optical lens assembly according to  claim 3 , wherein the focal length of the photographing optical lens assembly is f, the focal length of the first lens element is f1, and they satisfy the relation:
   1.32 <f/f 1<2.00. 
 
     
     
       5. The photographing optical lens assembly according to  claim 3 , wherein there are five lens elements with refractive power in the photographing optical lens assembly. 
     
     
       6. The photographing optical lens assembly according to  claim 5 , wherein the focal length of the first lens element is f1, a focal length of the third lens element is f3, and they satisfy the relation:
   0.25 <f 1 /f 3<1.20. 
 
     
     
       7. The photographing optical lens assembly according to  claim 6 , wherein a distance on the optical axis between the first and second lens elements is T12, the focal length of the photographing optical lens assembly is f, and they satisfy the relation:
   0.5<( T 12 /f )*100<9.5. 
 
     
     
       8. The photographing optical lens assembly according to  claim 6 , wherein the focal length of the photographing optical lens assembly is f, a focal length of the fifth lens element is f5, and they satisfy the relation:
   −0.35 <f/f 5<0.35.
 
 
     
     
       9. The photographing optical lens assembly according to  claim 5 , wherein the radius of curvature on the image-side surface of the second lens element is R4, the focal length of the photographing optical lens assembly is f, and they satisfy the relation:
   0.6 <R 4 /f< 2.0. 
 
     
     
       10. The photographing optical lens assembly according to  claim 5 , wherein the aperture stop is disposed between the first lens element and the second lens element; wherein the distance on the optical axis between the aperture stop and the electronic sensor is SL, the distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, and they satisfy the relation:
   0.78 <SL/TTL< 0.93. 
 
     
     
       11. The photographing optical lens assembly according to  claim 10 , wherein a thickness on the optical axis of the second lens element is CT2, the focal length of the photographing optical lens assembly is f, and they satisfy the relation:
   0.3<( CT 2 /f )*10<1.1. 
 
     
     
       12. The photographing optical lens assembly according to  claim 5 , wherein the fifth lens element has refractive power. 
     
     
       13. The photographing optical lens assembly according to  claim 2 , wherein the Abbe number of the first lens element is V1, the Abbe number of the second lens element is V2, and they satisfy the relation:
   31.0<V1-V2<42.0. 
 
     
     
       14. The photographing optical lens assembly according to  claim 2 , wherein the distance on the optical axis between the first and second lens elements is T12, the focal length of the photographing optical lens assembly is f, and they satisfy the relation:
   0.5<( T 12 /f )*100<5.5. 
 
     
     
       15. The photographing optical lens assembly according to  claim 2 , wherein the distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, half of the diagonal length of the effective pixel area of the electronic sensor is ImgH, and they satisfy the relation:
     TTL/ImgH< 1.95. 
 
     
     
       16. A photographing optical lens assembly comprising, in order from an object side to an image side:
 a first lens element with positive refractive power having a convex object-side surface; 
 a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface; 
 a third lens element with positive refractive power having a concave object-side surface and a convex image-side surface; 
 a fourth lens element with negative refractive power, at least one of the object-side and image-side surfaces thereof being aspheric; and 
 a fifth lens element having a convex object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric; and 
 wherein the photographing optical lens assembly further comprises an aperture stop, disposed between an imaged object and the third lens element, and an electronic sensor for image formation; wherein there are five lens elements with refractive power; 
 wherein a radius of curvature on the image-side surface of the second lens element is R4, a focal length of the photographing optical lens assembly is f, a distance on the optical axis between the first and second lens elements is T12, a distance on the optical axis between the aperture stop and the electronic sensor is SL, a distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, and they satisfy the relation:
   0.3 <R 4 /f< 30.0; 
   0.5<( T 12 /f )*100<15.0; 
   0.65 <SL/TTL< 1.10. 
 
 
     
     
       17. The photographing optical lens assembly according to  claim 16 , wherein the fourth lens element has a convex object-side surface and a concave image-side surface. 
     
     
       18. The photographing optical lens assembly according to  claim 17 , wherein there is at least one inflection point formed on the image-side surface of the fifth lens element, which is made of plastic. 
     
     
       19. The photographing optical lens assembly according to  claim 18 , wherein the radius of curvature of the image-side surface of the second lens element is R4, the focal length of the photographing optical lens assembly is f, and they satisfy the relation:
   0.5 <R 4 /f< 10.0. 
 
     
     
       20. The photographing optical lens assembly according to  claim 19 , wherein the aperture stop is disposed between the first and second lens elements, the distance on the optical axis between the aperture stop and the electronic sensor is SL, the distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, and they satisfy the relation:
   0.78 <SL/TTL< 0.93. 
 
     
     
       21. The photographing optical lens assembly according to  claim 18 , wherein the distance on the optical axis between the first and second lens elements is T12, the focal length of the photographing optical lens assembly is f, and they satisfy the relation:
   0.5<( T 12 /f )*100<9.5. 
 
     
     
       22. The photographing optical lens assembly according to  claim 21 , wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and they satisfy the relation:
   31.0<V1-V2<42.0. 
 
     
     
       23. The photographing optical lens assembly according to  claim 18 , wherein the focal length of the photographing optical lens assembly is f, the focal length of the first lens element is f1, and they satisfy the relation:
   1.32 <f/f 1<2.00. 
 
     
     
       24. The photographing optical lens assembly according to  claim 23 , wherein the focal length of the photographing optical lens assembly is f, a focal length of the fifth lens element is f5, and they satisfy the relation:
   −0.35 <f/f 5<0.35.
 
 
     
     
       25. The photographing optical lens assembly according to  claim 18 , wherein an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, and they satisfy the relation:
   23.0<V3-V4<45.0.

Cited by (0)

No later patents cite this yet.

References (0)

No backward citations on record.